How to use kfind to find files with no extension

[bdw]

I'm trying to search for files in a direction with kfind, but I only want to find files that do not have an extension.

Is there a regular expression that I can use in kfind to find files with no extension? I then want to use krename to batch rename the files.

I'm using Kubuntu 11.04.

[raja.genupula]

i think
kfind file*
will gives all the files with that file name